Mold for fabricating barrier rib and method of fabricating two-layered barrier rib using same

ABSTRACT

The disclosed mold includes recessed parts which have a shape corresponding to embossed portions of the barrier rib to be fabricated, and protruding parts which have a shape corresponding to depressed portions of the barrier rib to be fabricated, protrude adjacent to the recessed parts, and are tapered. The protruding parts and the recessed parts are arranged at regular intervals. It is possible to simply fabricate the two-layered barrier rib for inkjet application through a single embossing process at low cost using the mold for fabricating the barrier rib of the present invention.

BACKGROUND OF THE INVENTION

Priority is claimed to Application No. 2004-97649, filed in the Republicof Korea on Nov. 25, 2004, herein incorporated by reference.

1. Field of the Invention

The present invention relates, in general, to a mold for fabricating abarrier rib and a method of fabricating a two-layered barrier rib usingthe same and, more particularly, to a mold for fabricating a barrier ribthat includes a plurality of tapered protruding parts and recessed partshaving a shape corresponding to embossed portions of the barrier rib,and a method of fabricating a two-layered barrier rib for inkjetapplication using the same through a low-cost simple process.

2. Description of the Related Art

As shown in FIG. 1, a conventional barrier rib for display devices has avertically and horizontally striped structure so as to discriminate RGBpixels on a transparent glass substrate 2. A space between the barrierribs is empty and the adjacent surface is flat and transparent to atleast one wavelength so that light penetrates it. In a color filter forliquid crystal displays, an organic black matrix formed on the glasssubstrate may be exemplified as an application of barrier rib structure.

Methods of fabricating the color filter for liquid crystal displays isclassified into various methods, such as a pigment dispersion method, aprinting method, a dyeing method, an electrode position method, aphotolithographic method, and an inkjet printing method. Among them, theinkjet printing method has drawn much attention from the displayindustries in recent years because it has advantages in that, since itis possible to simultaneously produce red (R), green (G), and blue (B)color filters, the process is simple, the amount of material used isreduced, and thus the production cost is low.

According to the inkjet printing method, predetermined patterns, what iscommonly called a barrier rib structure formed on a substrate, areprepared and the recessed parts of the barrier rib are filled withcolored resins (R, G, and B) to fabricate a color filter. When anembossing process or an imprinting process employed for fabricatingbarrier ribs, a deformable composition for the barrier rib is pressedusing the mold having a predetermined pattern, and cured, and the moldis removed, thereby forming the barrier rib structure on the substrate.In other words, it is possible to apply the embossing process tofabricate a micropattern or a barrier rib. The embossing process may beclassified into a thermal embossing process, in which curing isconducted by temperature variation, and a UV embossing process, in whichcuring is conducted by UV radiation, according to a method of forming asolidified pattern. In the thermal embossing process, if material of thebarrier rib is thermoplastic, the material is heated at a glasstransition temperature or higher so as to be deformable or fluidic atthe molding temperature, pressure is applied thereto to conductembossing, the resulting material is solidified (more strictly speaking,glassified) by cooling after a pattern is formed, and the mold isremoved. Meanwhile, when using thermosetting material, the material ofthe barrier rib having fluidity is embossed, heated, and cured, and thenthe mold is removed.

With respect to a conventional method of preventing the nonuniformspread or mix-up between the adjacent pixels and staining of the barrierrib's surface by resins of color filter printed in an inkjet manner,Japanese Patent Laid-Open Publication No. 2001-42313 discloses a methodof neatly applying ink to an ink receiving structure between barrierribs (see FIG. 2).

In other words, as shown in FIG. 2, a barrier rib is patterned on aglass substrate 11 using photolithographic methods so as to have astructure consisting of two layers 12, 13. A lower layer 12 of thebarrier rib is made of a hydrophilic material that has affinity tohydrophilic ink and an upper layer 13 is made of hydrophobic materialthat has an aversion for ink so that the glass substrate 11 easilyreceives ink, and vice versa in the case of water-based ink. However, ifthe barrier rib is fabricated through the above methods, undesirably, aplurality of complicated coatings, mask aligning steps and exposureprocesses must be carried out.

Furthermore, there exist methods of employing materials having differentsurface properties or of conducting treatment using them so as to easilyreceive ink through a procedure similar to that of Japanese PatentLaid-Open Publication No. 2001-42313 as described above. For example,Japanese Patent Laid-Open Publication No., 2000-89022 discloses a methodof conducting exposure while an ink receiving layer is hidden using ablack matrix made of a resin composition having a light blockingproperty. Japanese Patent Laid-Open Publication No. 2000-28819 disclosesa method of polishing an ink receiving layer to flatten it, JapanesePatent Laid-Open Publication No. Hei. 11-194211 discloses a method offorming a second layer on a metal black matrix. Korean Patent Laid-OpenPublication No. 2001-110183 discloses a surface treatment method using aplasma.

However, all of the above methods need at least one additionalphotolithography process which incurs a high cost, particularly becauseof a surface treatment or the use of costly devices and fine chemicalsin great quantities. Therefore, there remains a need to develop a moldcapable of fabricating a barrier rib employing a simple low-cost processand an embossing method of fabricating the barrier rib using the mold.

SUMMARY OF THE INVENTION

The present inventors have conducted extensive studies into thesolutions of problems occurring in the prior art, resulting in thefinding that, when employing a mold for fabricating a barrier rib, whichincludes a plurality of tapered protruding parts and a plurality ofrecessed parts, and an embossing process according to the presentinvention, it is possible to relatively simply fabricate a two-layeredbarrier rib for inkjet applications, which includes an ink-philic layerand an ink-phobic layer, through a single embossing process, therebyaccomplishing various aspects of the present invention.

Therefore, an object of the present invention is to provide a mold forfabricating a barrier rib, which is capable of fabricating a two-layeredbarrier rib through a single embossing process.

Another object of the present invention is to provide a method ofrelatively simply fabricating the two-layered barrier rib which includesan ink-philic layer and an ink-phobic layer using the mold forfabricating the barrier rib through the single embossing process.

Still another object of the present invention is to provide atwo-layered barrier rib for inkjet application fabricated through theabove method of fabricating the barrier rib.

In order to accomplish the above objects, according to an aspect of thepresent invention, there is provided a mold for fabricating a barrierrib. The mold comprises a plurality of protruding parts and a pluralityof recessed parts. The protruding parts and the recessed parts arearranged at regular intervals, and the recessed parts have a shapecorresponding to embossed ink barrier portions to be fabricated. Theprotruding parts have shapes corresponding to depressed portions of thebarrier rib to be fabricated, protrude adjacent to the recessed parts,and are tapered, therefore each protruding part of the mold has atriangular loop-like shape (See FIGS. 3 a and 3 b). This tapered shapeof the mold makes the process simple as shown in later. Accordingly, thesurface of recessed part of embossed barrier rib structure is not flatrather grooved, however, it is almost flat as long as the apex angle ofthe top of the protruding part is not much less than 180°.

According to another aspect of the present invention, there is provideda method of fabricating a barrier rib. The method comprises (i) applyingink-philic material on a transparent substrate to form a lowerink-philic layer; (ii) applying ink-phobic material on the ink-philiclayer to form an upper ink-phobic layer; (iii) providing the mold forfabricating the barrier rib according to claim 1 on the ink-phobic layerand leaving the resulting structure for a predetermined time; (iv)radiating UV onto the backside of the transparent substrate or applyingheat to conduct curing; and (v) removing the mold.

According to still another aspect of the present invention, there isprovided a barrier rib fabricated through the above method.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the presentinvention will be more clearly understood from the following detaileddescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 schematically illustrates a barrier rib for displays;

FIG. 2 is a schematic sectional view of a conventional two-layeredbarrier rib;

FIG. 3 a illustrates a three-dimensional structure of a mold forfabricating a barrier rib, according to embodiments of the presentinvention;

FIG. 3 b is a sectional view taken along the line A-A′ of FIG. 3 a;

FIGS. 3 c and 3 d are confocal laser scanning microscope images whichshow the three-dimensional structure of the mold for fabricating thebarrier rib, and the embossed structure after completion of embossingprocess, according to embodiments of the present invention,respectively;

FIGS. 4 a-4 e illustrates the fabrication of a two-layered barrier ribusing the mold for fabricating the barrier rib, according to embodimentsof the present invention;

FIG. 5 illustrates the mold in an embossing step and deformation of atwo layers in the course of fabricating the two-layered barrier ribaccording to embodiments of the present invention;

FIGS. 6 a and 6 b are SEM pictures of the barrier rib fabricatedaccording to the present invention;

FIG. 7 a illustrates Raman spectrum of ORMOCER used as an ink-philicmaterial according to embodiments of the present invention to probe thepresence of ink-phobic material HEMA on the ink-philic section;

FIG. 7 b illustrates the barrier rib used in the Raman image mappingmeasurement;

FIG. 7 c illustrates two-dimensional micro-Raman mapping results of apatterned section of FIG. 7 a; and

FIG. 7 d is a graph of Raman intensity of ORMOCER in the direction ofthe arrow of FIG. 7 b.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, a detailed description will be given of the presentinvention, referring to the accompanying drawings.

The present invention relates to a mold which is used to fabricate abarrier rib, such as an organic black matrix of an inkjetted colorfilter for a liquid crystal display. In the mold of the presentinvention, since a protruding part protrudes adjacent to a recessed partand is tapered, two deformable layers having different ink-philicityconstituting the barrier rib is pressed and solidified at the same time,thus it is possible to simply fabricate a two-layered barrier rib usinga single embossing process at a low cost.

FIG. 3 a illustrates a three-dimensional structure of the mold forfabricating the barrier rib according to the present invention. Withreference to FIG. 3 a, a mold 30 for fabricating the barrier ribaccording to the present invention includes a predetermined pattern 31in which a plurality of protruding parts 31 a and a plurality ofrecessed parts 31 b are repeatedly arranged at regular intervals. Asshown in FIG. 3 b, the protruding parts 31 a have a shape correspondingto depressed portions of the barrier rib to be fabricated, protrudeadjacent to the recessed parts 31 b, and are tapered, therefore has apentahedral triangular loop-like shape. FIG. 3 c is confocal laserscanning microscope image which shows the three-dimensional structure ofthe mold for fabricating the barrier rib, according to embodiments ofthe present invention, and FIG. 3 d is the embossed structure aftercompletion of the present process. As shown in FIG. 3 c, edges of theprotruding parts 31 a of the mold according to embodiments of thepresent invention may have a pointed shape which is formed by meetingtwo sides at a predetermined angle, or a rounded edge shape, ifnecessary. In exemplary embodiments of the present invention, the moldmay be made of any material, such as silicon, metal, plastic, glass,semiconductor, or insulating material.

The fabricating method of the mold of the present invention havingtapered protruding parts includes well-known conventional fabricationtechniques for three-dimensional micro electromechanical systems (MEMS)such as a holographic lithography, anisotropic wet etching, LIGA, directlaser writing using excimer laser and so forth.

Another aspect of the present invention is characterized in that themold for fabricating the barrier rib and an embossing process areemployed to fabricate a two-layered barrier rib for inkjet applicationwhich includes an ink-philic layer and an ink-phobic layer. Hereinafter,a method of fabricating the two-layered barrier rib will be exemplified,but the method of the present invention may be applied to a multilayeredbarrier rib having two or more layers.

FIG. 4 illustrates the fabrication of a barrier rib using a mold 21 forfabricating the barrier rib according to the present invention through asingle embossing process. With reference to FIG. 4, in order tofabricate a two-layered barrier rib for inkjet application using themold 21 for fabricating the barrier rib according to the presentinvention, ink-philic material is applied on a transparent substrate 24to form an ink-philic layer (“lower layer”: 23), and ink-phobic materialis then applied on the ink-philic layer 23 to form an ink-phobic layer(“upper layer”: 22).

Material for the transparent substrate which is used to fabricate thebarrier rib of the exemplary embodiments of the present invention is notlimited, and may be properly selected from an inorganic substrate and anorganic substrate, depending on the application of the barrier rib. Thesubstrate is not necessarily transparent when the hot embossing methodis employed, however, transparent substrate is chosen as arepresentative example because the main application area of the presentinvention is display-related one.

The method of forming the ink-phobic layer 22 or the ink-philic layer 23is not limited, and a suitable method (for example, a spin coatingmethod or a dip coating method) may be chosen according tocircumstances.

When using a hydrophilic ink such as water or alcohol based solutions,the ink-philic layer 23 is made of hydrophilic material, and theink-phobic layer 22 is made of hydrophobic material. When using an oilyink, the ink-philic layer 23 is made of the hydrophobic material, andthe ink-phobic layer 22 is made of the hydrophilic material.

According to the processing feature of the present invention, theviscosity of the lower layer must be higher than that of the upper layerwhen the mold is pressed to maintain the desirable two-layer structure.Therefore, material having lower viscosity at a molding temperature isused as the ink-phobic material constituting the ink-phobic upper layer22, and material having higher viscosity at a molding temperature isused as the ink-philic material constituting the ink-philic lower layer23. The viscosity of each layer can be selected by controlling theircomposition or degree of polymerization.

Illustrative, but non-limiting examples of the hydrophobic materialsavailable to the present invention include isoprene, styrene, acrylatecontaining fluorine, methacrylate containing fluorine, monomers thereof,oligomers thereof, homopolymers or copolymers thereof, or organic orinorganic complexes containing silicon. Preferably, the hydrophobicmaterial is exemplified by ORMOCER which is manufactured by MicroresistCo., Germany.

Illustrative, but non-limiting examples of the hydrophilic materialavailable to the present invention include polyethylene glycol,polyurethane, polyamide, poly(2-hydroxy ethyl methacrylate), monomersthereof, oligomers thereof, or homopolymers or copolymers thereof.

Inorganics, such as silicone subjected to surface modification or carbonnanotubes, may be added to the ink-phobic layer 22 and the ink-philiclayer 23 so as to control hydrophilic and hydrophobic properties, butthe kind of material is not limited. Additionally, in the presentinvention, a UV initiator (for example, Irgacure 184), a heat initiator(for example, AIBN: 2,2′-Azobisisobutyronitrile), a crosslinking agent,a pigment, a dye, and a surfactant may be added to the ink-phobic layercomposition or the ink-philic layer composition, if necessary, but theirkind is not limited. Material that is more flexible than the mold 21 forfabricating the barrier rib and is deformable or fluidic is used asmaterial for forming the ink-phobic layer 22 and the ink-philic layer23.

After the ink-philic layer 23 and the ink-phobic layer 22 are formed onthe transparent substrate 24, the ink-phobic layer 22 is positioned soas to face protruding parts of the mold 21 for fabricating the barrierrib according to exemplary embodiments of the present invention. Themold comes into contact with the ink-phobic layer 22 while heat, orpressure, or heat and pressure are applied thereto, if necessary, andthen left for a predetermined time. As shown in FIG. 4 b, if the mold 21for fabricating the barrier rib is positioned on the ink-phobic layer 22and a predetermined pressure is then applied thereto to deform materialof the ink-phobic layer 22, stress is focused only on the ink-phobiclayer 22 because the material of the ink-phobic layer 22 has lowerviscosity than the material of the ink-philic layer 23, thus only theink-phobic layer 22 deforms or flows as shown at reference number 25. Inthis respect, the applied pressure may depend on the desired height ofthe barrier rib.

As shown in FIG. 4 c, even though deformation occurs after the moldcomes into contact with the lower layer, the upper layer and the lowerlayer do not mix with each other because of a difference in viscosityand hydrophilicity, and the final deformation is assured while the upperand the lower layer are maintained as they are after a predeterminedtime (FIG. 3 d).

As shown in FIG. 4 d, UV 26 irradiates to the backside of thetransparent substrate or heat is applied particularly to the resins tocure the barrier rib, and then the mold is removed, thereby creating astructure as shown in FIG. 4 e, in which an ink receiving layer 28 ahaving an affinity to ink is formed on a transparent substrate, anink-philic barrier rib portion 28 b having an affinity to ink is formedbelow the barrier rib, and the barrier rib 27 having an aversion for inkis formed thereon.

In the present invention, it is possible to adjust the height of theink-philic barrier rib portion 28 b or to remove it by controlling theamount of material of the ink-philic layer of FIG. 4 a or controllingthe pressure applied to the mold, depending on the purpose.

FIG. 5 illustrates the mold in an embossing step and deformation (flow)of two layers. If the mold is subjected to a surface treatment processor a coating process so as to have a hydrophilic or hydrophobic propertylike the ink-philic layer (lower layer), the ink-phobic layer (upperlayer) having the low viscosity meets the mold at a high angle of θbetween the mold having an affinity for ink and the lower layer, thusthe mechanical mixing of the upper and the lower layer does not takeplace during the embossing unless the pressing speed is not fast.Furthermore, the Reynolds number of the upper layer has the followingvalue under typical embossing conditions: $\begin{matrix}{{Re} \sim \frac{{LV}\quad\rho}{\eta} \sim {\left. \frac{\left( {1 \times 10^{- 5}\quad m} \right)\left( {1 \times 10^{- 5}\quad m\quad\sec^{- 1}} \right)\left( {10^{3\quad}{kg}\text{/}m^{3}} \right)}{\left( {10^{{- 2}\quad}{kgm}^{{- 1}\quad}\sec^{- 1}} \right)} \right.\sim 10^{- 5}}} & {{Equation}\quad 1}\end{matrix}$

Therefore, Re is low enough to guarantee an absence of vortex,turbulence or a secondary flow during embossing. In other words, theflow is a stable and laminar flow. In addition, the possibility of thepresence of a residual top resin on the outer surface of the bottomlayer is significantly lowered.

After the mold of exemplary embodiments of the present invention is leftfor a predetermined time, typically from zero to several tens ofseconds, UV irradiates to the backside of the transparent substrate orheat is applied to cure the ink-philic layer composition and theink-phobic layer composition. Finally, the mold is removed, therebyfabricating the barrier rib of the present invention.

The mold of embodiments of the present invention may be applied to abarrier rib, used to fabricate a color filter for liquid crystaldisplays, employing an inkjet printing method, a display part of aorganic light emitting display, or an organic thin film transistor, abarrier rib for a display part of a flexible display, or anelectrophoresis display or an electrowetting display, or a PDP cell, ora barrier rib for a combinatorial test plate.

A better understanding of the present invention may be obtained in lightof the following examples which are set forth to illustrate, but are notto be construed to limit the present invention.

EXAMPLE 1 Fabrication of a Two-Layered Barrier Rib for an InkjetPrinting Color Filter, which has a Hydrophilic Lower Layer and aHydrophobic Upper Layer, Through a UV Embossing Process

A monomer mixture liquid of 70 wt % aliphatic urethane-acrylatetelechelic oligomer (Ebecryl 284 manufactured by UCB, Inc.) and 30 wt %hexanediol diacrylate (HDDA manufactured by UCB, Inc.), which hadviscosity of 10,000 mPa·sec, as a solvent-free hydrophilic UV-curablematerial, was mixed with 0.75 wt % bisacylphosphine oxide (BAPO) as aphotoinitiator based on the total monomer mixture liquid, and theresulting mixture was applied on a glass substrate having a thickness of0.7 mm at 500 rpm for 30 sec to form an ink-philic layer (lower layer)having a thickness of 8 μm. 2,2,3,3-tetrafluoropropyl methacrylatemonomer (viscosity of 10 mPa·sec) as hydrophobic UV curable material,which contained 0.1 wt % solvent-free fluorine-based surfactant (FC-430manufactured by 3M Co.) and 1.0 wt % BAPO, was blade coated in athickness of 1 μm to form an ink-phobic layer (upper layer).Subsequently, a mold for fabricating a barrier rib according toembodiments of the present invention as shown in FIG. 3 a was broughtinto close contact with the entire surface of the upper layer, pressureof 5 kgf/cm² was applied thereto, and the resulting structure was leftfor 30 min. Thereafter, the backside of the glass substrate was exposedto UV of 1 kW for 3 min using a UV exposing machine, and the mold wasthen removed.

EXAMPLE 2 Fabrication of a Barrier Rib for an Inkjet Printing OLED,which has a Hydrophobic Lower Layer and a Hydrophilic Upper Layer,Through a UV/Hot Embossing Process

A surface of a mold was coated with a fluorine-based surfactant (Zonylmanufactured by DuPont, Inc.) and baked at 200□ so as to have ahydrophobic property. Poly(2,2,3,3-tetrafluoropropyl methacrylate)having a molecular weight of 100,000 (a glass transition temperature ofabout 66° C.) was dissolved in methylisobutylketone (MIBK) so as to havea concentration of 5 wt %, and applied on a glass substrate using a spincoater at a rotation rate of 2000 rpm to form a lower layer.2-hydroxyethyl methacrylate oligomer, which was produced by dissolvingIrgacure 184 and polymerizing it through UV polymerization until theviscosity was 1,000 mPa·sec, was applied thereon at a rotation rate of2000 rpm. Subsequently, the mold for fabricating a barrier rib accordingto the present invention was brought into close contact with the entiresurface of an upper layer, embossing was conducted while the temperatureof the mold and the glass substrate was set to 145° C. and pressure wasset to 5 kgf/cm², and the resulting structure was left for 30 min.Thereafter, the backside of the glass substrate was exposed to UV of 1kW for 3 min using a UV exposing machine, and the mold was then removed.

EXAMPLE 3 Fabrication of a Barrier Rib for an Inkjet Printing OLED,which has A Hydrophobic Lower Layer and a Hydrophilic Upper Layer,Through a UV Embossing Process

The surface of a mold was coated with a fluorine-based surfactant (Zonylmanufactured by DuPont, Inc.) and baked at 200° C. so as to have ahydrophobic property. ORMOCER B59 manufactured by Microresist Co., thatis, hydrophobic organic/inorganic hybrid UV curable resin, was appliedon a glass substrate using a spin coater at a rotation rate of 3000 rpm.2-hydroxyethyl methacrylate (HEMA) monomer containing Irgacure 184 wasapplied thereon in drops of 1 ml using a pipette. Subsequently, the moldfor fabricating a barrier rib according to the present invention wasbrought into close contact with the entire surface of an upper layer,embossing was conducted at room temperature and pressure of 5 kgf/cm²,the backside of the glass substrate was exposed to UV of 1 kW for 3 minusing a UV exposing machine, and the mold was removed.

SEM pictures of the barrier rib fabricated in example 3 are shown inFIGS. 6 a and 6 b. As shown in FIGS. 6 a and 6 b, in the mold of thepresent invention, protruding parts are tapered and edges may have arounded shape.

To evaluate the distribution of ORMOCER and HEMA in a section of themold fabricated in example 3, two-dimensional micro-Raman image mappingmeasurement was conducted using Nanofinder 30 (Tokyo Instruments), andthe results are shown in FIGS. 7 a to 7 d. As shown in FIG. 7 a, a peakcorresponding only to ORMOCER was observed using the Raman spectrum. Thesection which was patterned so as to have the above peak was mapped inthe direction of the arrow of FIG. 7 b, thereby obtainingtwo-dimensional distribution as shown in FIG. 7 c. Experimentalconditions were set so that a diode laser was 785 nm, a point was 100, astep was 100, a shift speed was 2, and an exposure time was 0.5 sec. Theintensity variation of ORMOCER in the direction indicated by the arrowin FIGS. 7 b and 7 c are shown in FIG. 7 d, and it can be confirmed thatonly HEMA was dispersed on the surface of the upper layer because theORMOCER peak is almost 0 at the upper layer, and that only ORMOCER wasdispersed on the lower layer because the ORMOCER peak is almost 100 atthe lower layer. Accordingly, in the present invention, a two-layeredbarrier rib structure having different hydrophilicity is fabricatedthrough a simple, single embossing process.

As described above, it is possible to fabricate a barrier rib comprisingtwo layers having different physicochemical properties through a singlelow-cost process using a mold for fabricating the barrier rib ofembodiments of the present invention without using complicatedprocesses, costly lithography and high pressure devices. It is possibleto easily and precisely form a pattern using the mold for fabricatingthe barrier rib, which has tapered protruding parts according toembodiments of the present invention.

1. A mold for fabricating a barrier rib, comprising: a plurality ofprotruding parts; and a plurality of recessed parts, wherein, theprotruding parts and the recessed parts are arranged at regularintervals, the recessed parts have a shape corresponding to embossedportions of the barrier rib to be fabricated, and the protruding partshave a shape corresponding to depressed portions of the barrier rib tobe fabricated, protrude adjacent to the recessed parts, and are tapered.2. The mold as set forth in claim 1, wherein the mold is made ofmaterial selected from the group consisting of metal, semiconductors,and insulating material, and edges of the protruding parts have one of ashape which is formed by two sides meeting at a predetermined angle anda rounded shape.
 3. A method of fabricating a two-layered barrier rib,comprising: (i) applying ink-philic material on a transparent substrateto form a lower ink-philic layer; (ii) applying ink-phobic material onthe ink-philic layer to form an upper ink-phobic layer; (iii) providingthe mold for fabricating the barrier rib according to claim 1 on theink-phobic layer and leaving a resulting structure for a predeterminedtime; (iv) radiating UV or applying heat onto a backside of thetransparent substrate to conduct curing; and (v) removing the mold. 4.The method as set forth in claim 3, wherein viscosity of the ink-phobicmaterial is lower than viscosity of the ink-philic material.
 5. Themethod as set forth in claim 3, further comprising applying at least oneof heat and pressure after the mold is provided in the step (iii). 6.The method as set forth in claim 3, wherein the ink-philic layer is madeof hydrophilic material and the ink-phobic layer is made of hydrophobicmaterial when a hydrophilic ink is used, and the ink-philic layer ismade of the hydrophobic material and the ink-phobic layer is made of thehydrophilic material when an oily ink is used.
 7. The method as setforth in claim 4, wherein the ink-philic layer is made of hydrophilicmaterial and the ink-phobic layer is made of hydrophobic material when ahydrophilic ink is used, and the ink-philic layer is made of thehydrophobic material and the ink-phobic layer is made of the hydrophilicmaterial when an oily ink is used.
 8. The method as set forth in claim6, wherein the hydrophobic material is one or more copolymers selectedfrom the group consisting of isoprene, styrene, acrylate containingfluorine, methacrylate containing fluorine, monomers thereof, oligomersthereof, homopolymers or copolymers thereof, and organic or inorganiccomplexes containing silicon.
 9. The method as set forth in claim 6,wherein the hydrophilic material is material selected from the groupconsisting of polyethylene glycol-, polyurethane-, polyamide-, andpoly(2-hydroxy ethyl methacrylate)-based homopolymer or copolymer. 10.The method as set forth in claim 7, wherein the hydrophobic material isone or more copolymers selected from the group consisting of isoprene,styrene, acrylate containing fluorine, methacrylate containing fluorine,monomers thereof, oligomers thereof, homopolymers or copolymers thereof,and organic or inorganic complexes containing silicon.
 11. The method asset forth in claim 7, wherein the hydrophilic material is materialselected from the group consisting of polyethylene glycol-,polyurethane-, polyamide-, and poly(2-hydroxy ethyl methacrylate)-basedhomopolymer or copolymer.
 12. The method as set forth in claim 3,further comprising surface treating or coating a surface of the moldusing material constituting the ink-philic layer.
 13. The method as setforth in claim 4, further comprising surface treating or coating asurface of the mold using material constituting the ink-philic layer.14. The method as set forth in claim 3, further comprising conductingcooling to achieve curing between the steps (iii) and (iv) when one orboth of the ink-phobic material and the ink-philic material arethermoplastic material.
 15. A barrier rib fabricated according to themethod of claim
 3. 16. The barrier rib as set forth in claim 15, whereinthe barrier rib is used to fabricate one of a color filter for flatpanel displays, an organic light emitting display, and an organic thinfilm transistor, using an inkjet printing process.
 17. The barrier ribas set forth in claim 15, wherein the barrier rib is used for a displaypart of one of a flat panel display, including an electrophoresisdisplay and an electrowetting display, a PDP or a flexible display. 18.The barrier rib as set forth in claim 15, wherein the barrier rib isused for a combinatorial test plate.